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Apr 28, 2015
This week’s theme
Duoliteral words

This week’s words
os
aa

aa
Photo: USGS

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A.Word.A.Day
with Anu Garg

aa

PRONUNCIATION:
(AH-ah)

MEANING:
noun: Lava having a rough surface.

ETYMOLOGY:
From Hawaiian aa (to burn). Earliest documented use: 1859.

NOTES:
Aa is one of the two kinds of lava typically found in Hawaiian volcanoes. The other kind is pahoehoe, one with a smooth, ropy surface.

USAGE:
“The type of lava most prevalent on Bartolomé Island is aa lava; it has a lower temperature and less gas content, which makes for a slower flow, which causes broken flows and sharp edges.”
Ilene Cox; One More Day in the Galapagos Islands; Redlands Daily Facts (California); Sep 25, 2005.

See more usage examples of aa in Vocabulary.com’s dictionary.

A THOUGHT FOR TODAY:
"Don't think of it as dying," said Death. "Just think of it as leaving early to avoid the rush." -Terry Pratchett, novelist (Apr 28 1948-2015)

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